This abstract sculpture is rumored to cast a hammer-and-sickle shadow once a year.

Abandoned rock quarry now a haven for mountain bikers and hikers.

This monster board rode a monster wave to break two world records.

Memorials and tributes scattered across the university grounds remember a famous national tragedy of the Nixon era.

This deserted Gold Rush town is home to a Masonic lodge that, strangely enough, still holds meetings.

Running under an entire mountain, the longest highway tunnel in North America is kept fresh using portal fans and jet fans.

Homemade rockets, dinosaurs, and robots make this New York small business much more than a furniture store.

The Tallahassee Airport serves over half a million passengers a year and is home to some permanent residents too.

Daredevil repair workers can worm their way out the access hatch, loop ropes over the apex and rappel down the monument.

A rich history stashed behind an unassuming door in the heart of Gold Country.

How Quincy, Florida became the richest town per capita due to one man's shrewd business acumen and taste for fizzy drinks.

A playing field for a popular French past time can be found tucked away in a quiet corner of Golden Gate Park.

A ghost town that held steady longer than most, but finally gave up the ghost.

An abandoned guano-mining city in the South Pacific.

Oldest surviving example of a Dutch saltbox frame house in America.

Atlanta's strange assortment of concrete pillars inspires reflection in some, confusion in others.

This Tennessee museum is dedicated to a tragic railroad hero who inspired the famous ballad that bears his name.

The world's tallest doric column is this Ohio monument to a naval victory in the War of 1812.

This giant green head remembers one of America's jazz giants.

This anonymous businessman sculpted in bronze became an enduring memorial after 9/11, and had been mistaken by rescue workers for a survivor in the rubble.

An eerie smiling woman looms above the granite tombstones.

An eclectic treasure trove of maritime marvels.

Manhattan and the Bronx have been playing tug-of-war over this former island neighborhood for more than a century.

The only nuclear weapon assembly and disassembly plant in the U.S.